Apple doesn’t ask for or take a mandatory cut of in-app money transfer services. They also don’t take a cut of any physical goods sales (e.g. grocery shopping) or physical services (e.g. Uber car rides).

They take a 15% or 30% cut of all in-app experiences (e.g. entertainment, productivity software, content subscriptions). This is levied through the App Store and IAP.

(They take 0.15% of card payments if they are routed through Apple Pay, levied from the regular merchant fee associated with all card payments. However this is not forced on anyone and bank pays anyway, willingly, as the lower rate of fraud means the fee represents good value.)